akasoft opened the ticket and wrote:

Start game on 1964, using cheats buy 2TE10 locomotive (train 1) and 2TE10L (train 2). On tab Capacities can see default livery: both "Capacity: None (livery 1)". Train 1 has 3 possible liveries ([0, 1, 2]), train 2 - only 2 ([0, 1]). (screenshot rb1.png)

Attach train 2 to train 1. We can see all 3 the livery in the Refit window. Select "livery 3" and refit to. (screenshot rb2.png)

We can see result on 2TE10L at the mouse pointer: "Capacity: None" instead "Capacity: None (livery 3)" like 2TE10 above.
2TE10L has no livery 3, but variable cargo_subtype (NML) is changet previus value (0) to 2 while valid range is [0, 1] for the 2TE10L. (screenshot rb3.png)

Expected: 2TE10 change livery to the livery 3, 2TE10L not changed livery and stay on the livery 1.

Next, buy the 'Luggage car 20,2m'. He had 3 livery ([0, 1, 2]) and 2 possible cargos. Attach it to train 1. (screenshot rb4.png)
And then refit all to "Goods (Red Arrow)". Result on screenshot rb5.png. the 'Luggage car 20,2m' has changed the livery. Good. But locomotives has changed livery too, both to livery 2!

Expected: car with same ID changes livery, locomotive (other ID) - not.

Screenshots, grf and savegame are attached.

I think, this is the bug.
Or still feature? :)

windows x64, openttd trunk 24459, grf build with NML r1966 (c8088e3c6e83).

Attachments

• rb1.png (341.99 KiB)
• rb2.png (342.25 KiB)
• rb3.png (342.17 KiB)
• rb4.png (344.84 KiB)
• rb5.png (354.84 KiB)
• xussr.grf (6259.30 KiB)
• rb_bug.sav (24.41 KiB)
• rb_bug_2.sav (24.43 KiB)

Reported version: trunk
Operating system: Windows

This issue was imported from FlySpray: https://bugs.openttd.org/task/5268